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Adrien Waksberg 2019-08-13 22:14:09 +02:00
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# CHANGELOG
All notable changes to this project will be documented in this file.
This project adheres to [Semantic Versioning](http://semver.org/).
Which is based on [Keep A Changelog](http://keepachangelog.com/)
## Unreleased
### Added
- Fetch data on openweathermap.org
- Send data to influxdb
- Use config file
- Daemon mode

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Copyright 2019 Adrien Waksberg
Licensed under the Apache License, Version 2.0 (the "License");
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# Weather
[![Version](https://img.shields.io/badge/latest_version-1.0.0_dev-green.svg)](https://git.yaegashi.fr/nishiki/weather/releases)
[![License](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](https://git.yaegashi.fr/nishiki/weather/src/branch/master/LICENSE)
weather is a small program that fetch weather informations, and store them to influxdb
## How to
### Build
- Install [golang](https://golang.org/doc/install)
- Download and build
```bash
git clone https://git.yaegashi.fr/nishiki/weather
cd weather
go build
```
### Sample config
```yaml
---
openweathermap:
api_key: XXXX
units: metric
influxdb:
url: http://127.0.0.1:8086
database: test
measurement: weather
username: weather
password: secret
cities:
- Paris
- York,GB
interval: 600
```
### Run
- Run in oneshot mode
```bash
weather -config weather.yml
```
- Run in daemon mode
```bash
weather -config weather.yml -daemon
```
## License
```text
Copyright (c) 2019 Adrien Waksberg
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
```

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package main
import (
"fmt"
"io/ioutil"
yaml "gopkg.in/yaml.v2"
)
type Config struct {
InfluxDB struct {
URL string `yaml:"url"`
Database string `yaml:"database"`
Measurement string `yaml:"measurement"`
Username string `yaml:"username"`
Password string `yaml:"password"`
} `yaml:"influxdb"`
OpenWeatherMap struct {
ApiKey string `yaml:"api_key"`
Units string `yaml:"units"`
} `yaml:"openweathermap"`
Cities []string `yaml:"cities"`
Interval int64 `yaml:"interval"`
}
func (c *Config) Load(path string) error {
data, err := ioutil.ReadFile(path)
if err != nil {
return err
}
err = yaml.Unmarshal(data, &c)
if err != nil {
return err
}
c.Defaults()
err = c.Check()
if err != nil {
return err
}
return nil
}
func (c *Config) Defaults() {
if c.OpenWeatherMap.Units == "" {
c.OpenWeatherMap.Units = "metric"
}
if c.Interval == 0 {
c.Interval = 600
}
if c.InfluxDB.URL == "" {
c.InfluxDB.URL = "http://127.0.0.1:8086"
}
if c.InfluxDB.Measurement == "" {
c.InfluxDB.Measurement = "weather"
}
}
func (c *Config) Check() error {
if c.InfluxDB.Database == "" {
return fmt.Errorf("you must specify influxdb.database in config file")
}
if c.OpenWeatherMap.ApiKey == "" {
return fmt.Errorf("you must specify api_key in config file")
}
return nil
}

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package main
import (
"fmt"
"flag"
"os"
"time"
)
var (
URI = "https://api.openweathermap.org/data/2.5"
CONFIG = flag.String("config", "", "config file path")
DAEMON = flag.Bool("daemon", false, "run in daemon mode")
HELP = flag.Bool("help", false, "print this help message")
)
func init() {
flag.Parse()
}
func main() {
var w Weather
if *HELP {
flag.PrintDefaults()
os.Exit(1)
}
if *CONFIG == "" {
fmt.Println("you must specify a config file with -config option")
os.Exit(1)
}
err := w.Config.Load(*CONFIG)
if err != nil {
fmt.Printf("%s\n", err)
os.Exit(2)
}
for {
startTime := time.Now().Unix()
w.FetchData()
err = w.SendToInfluxDB()
if err != nil {
fmt.Printf("%s\n", err)
}
if *DAEMON == false {
if err == nil {
os.Exit(0)
} else {
os.Exit(2)
}
}
sleepTime := time.Now().Unix() - startTime + w.Config.Interval
if sleepTime > 0 {
time.Sleep(time.Duration(sleepTime) * time.Second)
}
}
}

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package main
import (
"fmt"
"net/http"
"encoding/json"
"io/ioutil"
"time"
influx "github.com/influxdata/influxdb1-client/v2"
)
type Weather struct {
Config Config
WeatherDatas []WeatherData
}
type WeatherData struct {
City string `json:"name"`
Main struct {
Humidity int `json:"humidity"`
Pressure int `json:"pressure"`
Temperature float32 `json:"temp"`
} `json:"main"`
Clouds struct {
All int `json:"all"`
} `json:"clouds"`
Rain struct {
OneHour float32 `json:"1h"`
TreeHours float32 `json:"3h"`
} `json:"rain"`
Snow struct {
OneHour float32 `json:"1h"`
TreeHours float32 `json:"3h"`
} `json:"snow"`
Wind struct {
Speed float32 `json:"speed"`
Direction int `json:"deg"`
} `json:"Wind"`
Sys struct {
Country string `json:"country"`
} `json:"sys"`
}
func (w *Weather) FetchData() {
for _, city := range w.Config.Cities {
resp, err := http.Get(
fmt.Sprintf(
"%s/weather?q=%s&appid=%s&units=%s",
URI,
city,
w.Config.OpenWeatherMap.ApiKey,
w.Config.OpenWeatherMap.Units,
),
)
if err != nil {
fmt.Printf("%s", err)
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Printf("%s", err)
}
weatherData := WeatherData{}
json.Unmarshal(data, &weatherData)
w.WeatherDatas = append(w.WeatherDatas, weatherData)
time.Sleep(500 * time.Millisecond)
}
}
func (w *Weather) SendToInfluxDB() error {
conn, err := influx.NewHTTPClient(influx.HTTPConfig{
Addr: w.Config.InfluxDB.URL,
Username: w.Config.InfluxDB.Username,
Password: w.Config.InfluxDB.Password,
})
if err != nil {
return err
}
bps, _ := influx.NewBatchPoints(
influx.BatchPointsConfig{
Database: w.Config.InfluxDB.Database,
})
for _, weather := range w.WeatherDatas {
tags := map[string]string{ "city": weather.City, "country": weather.Sys.Country }
fields := map[string]interface{}{
"temperature": weather.Main.Temperature,
"humidity": weather.Main.Humidity,
"pressure": weather.Main.Pressure,
"clouds": weather.Clouds.All,
"wind_speed": weather.Wind.Speed,
"wind_direction": weather.Wind.Direction,
"rain_1h": weather.Rain.OneHour,
"rain_3h": weather.Rain.TreeHours,
"snow_1h": weather.Snow.OneHour,
"snow_3h": weather.Snow.TreeHours,
}
point, _ := influx.NewPoint(w.Config.InfluxDB.Measurement, tags, fields, time.Now())
bps.AddPoint(point)
}
err = conn.Write(bps)
if err != nil {
return err
}
return nil
}